blob: 6f0329b658d7bbc781dd7e0f91c200c4fac461cf [file] [log] [blame]
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include <memory>
#include "webrtc/modules/audio_mixer/audio_mixer_defines.h"
#include "webrtc/modules/include/module.h"
#include "webrtc/modules/include/module_common_types.h"
namespace webrtc {
class MixerAudioSource;
class AudioMixer {
static const int kMaximumAmountOfMixedAudioSources = 3;
enum Frequency {
kNbInHz = 8000,
kWbInHz = 16000,
kSwbInHz = 32000,
kFbInHz = 48000,
kDefaultFrequency = kWbInHz
// Factory method. Constructor disabled.
static std::unique_ptr<AudioMixer> Create(int id);
virtual ~AudioMixer() {}
// Add/remove audio sources as candidates for mixing.
virtual int32_t SetMixabilityStatus(MixerAudioSource* audio_source,
bool mixable) = 0;
// Returns true if an audio source is a candidate for mixing.
virtual bool MixabilityStatus(const MixerAudioSource& audio_source) const = 0;
// Inform the mixer that the audio source should always be mixed and not
// count toward the number of mixed audio sources. Note that an audio source
// must have been added to the mixer (by calling SetMixabilityStatus())
// before this function can be successfully called.
virtual int32_t SetAnonymousMixabilityStatus(MixerAudioSource* audio_source,
bool mixable) = 0;
// Performs mixing by asking registered audio sources for audio. The
// mixed result is placed in the provided AudioFrame. Can only be
// called from a single thread. The rate and channels arguments
// specify the rate and number of channels of the mix result.
virtual void Mix(int sample_rate,
size_t number_of_channels,
AudioFrame* audio_frame_for_mixing) = 0;
// Returns true if the audio source is mixed anonymously.
virtual bool AnonymousMixabilityStatus(
const MixerAudioSource& audio_source) const = 0;
// Output level functions for VoEVolumeControl. Return value
// between 0 and 9 is returned by voe::AudioLevel.
virtual int GetOutputAudioLevel() = 0;
// Return value between 0 and 0x7fff is returned by voe::AudioLevel.
virtual int GetOutputAudioLevelFullRange() = 0;
AudioMixer() {}
} // namespace webrtc